Plural temperature refrigerating apparatus



June 19, 1956 B. K. FARE ETAL 2,750,761

PLURAL TEMPERATURE REFRIGERATING APPARATUSES Filed Sept. 28, 1953 2 Sheets-Sheet 1 T\ l l P- I: *1-- m l I..

m I E \5 I J22 I I I l I Iuvcurons BROR Invur FARE ,mo ERIK HOLGER FRANZEU BY M ATTORNEKS June 19, 1956 B. K. FARE ETAL 2,750,761

PLURAL TEMPERATURE BEFRIGERATING APPARATUSES Filed Sept. 28, 1953 2 Sheets-Sheet 2 :6 E I VENTORS BRoR KNUT' FARE. mo ERIK H01. ER FRANZEN A TTORNE Y5 PLURAL TEMPERATURE REFRIGERATING APPARATUSES Bror Knut Fare, Sibbhult, and Erik Holger Franzen, Lonsboda, Sweden, assignors to Aktiebolaget Fare Sdrmaturfabrik, Sibbhult, Sweden, a corporation of weden Application September 28, 1953, Serial No. 382,785

3 Claims. (Cl. 62117.3)

This invention relates to a refrigerating apparatus which is characterized in that it is constituted by at least one refrigerator and at least one freezing box which are combined to a unit having separate coolant circuits but a common motor compressor assembly for compressing the coolant in the coolant circuits.

The invention will be described more in detail in the following, reference being had to the accompanying drawings illustrating an embodiment of the invention. In the drawing:

Fig. 1 is a front view of a refrigerating apparatus according to the invention.

Fig. 2 is a section of a motor compressor assembly which is employed for the refrigerating apparatus according to Fig. 1.

The refrigerating apparatus shown comprises in the customary manner a heat insulated housing 1, the interior of which is divided by means of a partition 2 into a small chamber and a large chamber. The small chamber is available from outside through a door 3 and serves as a refrigerator, while the large chamber is available from outside through a door 4 and serves as a freezing box. The partition 2 branches out at the lower end in order to enclose a chamber 5 for a motor compressor assembly 6 which serves the purpose of compressing a coolant in two separate coolant circuits, one of which pertains to the refrigerator and the other to the freezing box. Said coolant circuits are of a known type and need not therefore be described and shown in detail.

The motor compressor assembly 6 used in the refrigerating apparatus has a frame 7 for two compressors and two electric motors. In the embodiment shown the compressors are of the piston type and each of said compressors has thus a piston 8 and 9, respectively, movable in a cylinder in the frame 7, and a pertaining connecting rod 10 and 11, respectively, grasping an eccentric 12 and 13, respectively, with its annular end. Each of the two electric motors have a stator 14 and 15, respectively, mounted in the frame 7, and a pertaining rotor 16 and 17, respectively. The rotor 17 and the eccentric 12 are secured adjacent opposite ends of an inner shaft 18 which is mounted adjacent the eccentric 12 in the frame 7 by means of a friction bearing bushing 19. The rotor 16 and the eccentric 13 are secured to opposite ends of a tubular shaft 20 which is passed onto the shaft 18 and is rotatably mounted on said shaft by means of bearing bushings secured to the ends of the shaft 20. Said shaft is also nited States Patent 0 "ice mounted in a friction bearing bushing in a bearing bracket 21 on a partition 22 of the frame 7. Besides, friction bearing washers 23 are inserted between the eccentrics 12 and 13.

It will readily be realized that the motor compressor assembly described above can be of a fundamentally similar design when the assembly shall comprise three or more motor and compressor units, e. g. when it is desired to divide the freezing box section of the refrigerating apparatus into two or more compartments of different temperatures. In such a case the principle is that the innermost shaft is mounted only at one end in the frame 7, while the outer shafts are mounted on the next inner shaft and the outermost shaft is besides mounted in the frame 7, whereas the various compressor units and motor rotors are arranged after one another, as seen along the common centre axis of the shafts.

What we claim and desire to secure by Letters Patent is:

1. A refrigerating apparatus comprising at least one refrigerator and at least one freezing box which are combined in a unit and having separate coolant circuits, a frame, a common motor compressor assembly for compressing the coolants in the coolant circuits on said frame, the motor compressor assembly having a compressor unit and a motor rotor for each coolant circuit, each rotor being connected to the compressor unit which it drives by means of a shaft, the shafts being arranged coaxially, the outside shafts bearing on the inner shafts, compressor units and motor rotors being arranged side by side along the common centre axis of the shafts.

2. A refrigerating apparatus as claimed in claim 1 in which the innermost shaft is mounted only at one end on said frame, the remaining shafts being mounted on the next inner shaft, and the outermost shaft being mounted on said frame.

3. In a refrigerating apparatus having at least one refrigerator and one freezing box combined in a unit and having separate coolant circuits, the combination of a frame, a common motor compressor assembly for compressing the coolants in the coolant circuits and said frame, the motor compressor assembly having a compressor unit and a motor rotor for each coolant circuit, each rotor being connected to the compressor unit which it drives by means of a shaft, the shafts being arranged coaxially, the outside shafts bearing on the inner shafts, the compressor units and motors being arranged side by side along the common center axis of the shafts, the innermost shaft being mounted only at one end on said frame, the remaining shafts being mounted on the next inner shaft, and the outermost shaft being mounted on said frame.

References Cited in the file of this patent UNITED STATES PATENTS 1,508,805 Shaw et a1. Sept. 16, 1924 2,062,054 Huggins Nov. 24, 1936 2,123,497 Buchanan July 12, 1938 2,309,797 Stickel Feb. 2, 1943 2,548,756 Winther Apr. 10, 1951 

